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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Toxicity of MBS to activated sludge was evaluated by Bayer AG (1990) according to the ISO 8192 -1986/B yielding an EC50 of >10000 mg/l after 3 hours exposure.

Key value for chemical safety assessment

Additional information

A hydrolysis half-life time of MBS of ca. 24 h was observed in deionised and environmental water buffered at pH 7.0. Benzothiazole-2-thiole (MBT) and benzothoazole (BT) as hydrolysis products are considered here to support the assessment of MBS. The observed effects are most probably a combined effect of the parent substance and the hydrolysis products.

The obtained EC50-value was far about the water solubility, but describes a realistic scenario for the sewage treatment plant.